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11-20-2019, 12:14 PM
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#1
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Junior Member
Join Date: Jan 2019
Location: Charleston
Posts: 9
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furnace problem
atwood furnace model afmd30121 comes on but will not stay lit.
The blower comes on then the flame come on for a few seconds the goes out it does this 3 times and the shuts off.
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11-20-2019, 12:39 PM
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#2
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Site Team
Join Date: Jul 2014
Location: Modesto
Posts: 20,357
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Welcome to the forum. Sorry it has to be under these circumstances, but let’s see if we can get you going again.
The furnace does light, you get a flame for about 10 seconds and then the flame quits and the fan keeps running?
__________________
2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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11-20-2019, 02:31 PM
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#3
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Junior Member
Join Date: Jan 2019
Location: Charleston
Posts: 9
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The blower comes on then the flame comes on for a few seconds the goes out it does this 3 times and the shuts off.
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11-20-2019, 05:26 PM
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#4
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Senior Member
Join Date: Nov 2012
Location: Fruitland
Posts: 3,357
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When mine had the same problem it was a faulty control board replaced under warranty in the listed RV. Some on here have mentioned the sail switch failed in their RVs and that can cause the same malfunction.
__________________
2013 24RKSWE (27ft TT) Cougar 1/2 ton series SOLD 10-2021
2013 Ford F350 4x4 CC 6.7 engine, 8 ft bed, 3.55 rear end, lariat package
Retired from Oregon State Police in 2011 than worked another 9.5 years as a small town traffic cop:
As of 05-2020, I am all done with 39 years total police work. No more uniforms for me.
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11-20-2019, 05:37 PM
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#5
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Senior Member
Join Date: Jul 2013
Location: Box Elder
Posts: 2,910
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If the burner ignites, then the sail switch is working. If it wasn't, you would not get gas ignition. It is either the control board or the electrode not sensing a flame and shutting down the process because it thinks there was not ignition.
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Bob & Becky
2012 3402 Montana
2012 Chevy 2500HD D/A CC
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11-20-2019, 06:22 PM
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#6
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Site Team
Join Date: Jul 2014
Location: Modesto
Posts: 20,357
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Quote:
Originally Posted by bobbecky
If the burner ignites, then the sail switch is working. If it wasn't, you would not get gas ignition. It is either the control board or the electrode not sensing a flame and shutting down the process because it thinks there was not ignition.
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That’s what I’m thinking.
__________________
2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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12-05-2019, 08:35 AM
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#7
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Senior Member
Join Date: Sep 2017
Location: Qualicum Beach
Posts: 555
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Quote:
Originally Posted by Ken / Claudia
When mine had the same problem it was a faulty control board replaced under warranty in the listed RV. Some on here have mentioned the sail switch failed in their RVs and that can cause the same malfunction.
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You can check the sail switch with a VOM. Meter both sides when fan is running, it should be 12V to ground once the fan is up to speed in a couple of seconds. Sounds more like a gas supply issue or a failed board. Check the LED on tyhe board to see what it says. If you replace the board get the Dinosaur brand, they make NASA parts
https://www.amazon.ca/gp/product/B00...?ie=UTF8&psc=1
Change the above to .com if you are in the USA
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12-05-2019, 08:43 AM
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#8
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Senior Member
Join Date: May 2013
Location: Aliso Viejo Ca
Posts: 108
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I had a similar issue on my 2018 Cougar 367FLS in May. I pulled off access panel to the heater. Removed exhaust pipe and expose control board. Control board has two wires connected. At the advice of my local RV tech I unplugged both wire and waiting 30 seconds. I plugged them back in and this basically rebooted the control board. Reinstalled exhaust pipe(it would not ignite without exhaust pipe in place). All worked good after that.
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11-20-2019, 06:53 PM
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#9
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Site Team
Join Date: Feb 2014
Location: W. Texas
Posts: 17,700
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Quote:
Originally Posted by horneb
The blower comes on then the flame comes on for a few seconds the goes out it does this 3 times and the shuts off.
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Exact same symptoms....control board fixed it.
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Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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11-20-2019, 05:55 PM
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#10
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Senior Member
Join Date: Dec 2018
Location: grand rapids
Posts: 596
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try disconnect gas tanks and then reconnect. are the tanks full?
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12-06-2019, 08:14 PM
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#11
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Site Team
Join Date: Jul 2014
Location: Modesto
Posts: 20,357
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Actually operating the stove, water heater and furnace on LP at the same time is a quick down and dirty way to test the regulator. If you have access to a manometer, you can tap into the gas valve at the water heater or fridge and actually measure the flow.
__________________
2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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